Filariidae) in bullocks (Indian and Siamese). Both of these 

 nematodes are quite distinct from F. gibsoni. 



It is quite distinct from Filaria labiato-papillosa, Ales- 

 sandr., (syn. F.cervina, Dies.) which occurs in the peritoneal 

 cavity and adjacent connective tissues of cattle and various 

 deer (Cervidie). 1 This parasite does not possess the 

 cuticular ridges of F. gibsoni and has a quite different 

 arrangement of papillae, being closely allied to F. equina 

 of the horse. 



It is now time that we should compare F. gibsoni with 

 Spiroptera reticulata, Dies, or better, Filaria reticulata, 

 on account of the position of the vulva and of other filarial 

 characters. This species was first described by Diesing in 

 1841 and made a type of a new genus Onchocerca, Dies. 

 The generic characters (freely translated) as given by him 2 

 are as follows:— Body filiform; male loosely spiral; female 

 twisted into a close spiral; head continuous with the body; 

 mouth terminal, orbicular ; caudal extremity of the male 

 excavated below and provided with two vertical lobes the 

 base of each of which possesses a great number of small 

 hooks and a papilla on the upper margin of each lobe; fili- 

 form penis between the lobes; female attentuated and 

 genital aperture situated anteriorly, etc. The type species 

 O. reticulata, Dies., is designated thus:— Body of female 

 superficially delicately reticulo-annulate; male, length 1*5 

 cm., diameter 0*125 mm.; female, length 1*5 cm., diameter 

 0*25 mm. The host given is the horse. Filaria reticulata, 

 Creplin, 1846, is given as a synonym. Dujardin, Schneider, 4 



1 Diesing, 18H, quoted in his " System a Helminthum," n. 1851, p, 287. 

 Dajardin, Hist Nat. des Helm, ou Vers intestinaux, 1815. 

 Schneider, Monographic der Neinatoden, 1866. 

 Yon Linstow, Compendium der Helminthologie, 1878; and Supple- 



Davaine, Traite des Entozoaires € 



